J. Navarro, C. Frenk, and S. White. (1996)cite arxiv:astro-ph/9611107
Comment: typos in eqs A5 and A14 corrected. In press in the ApJ, Dec 1, 1997.
Full PS file with figures can be obtained from
http://penedes.as.arizona.edu/~jfn/preprints/dprof.ps.gz.